a53163660f
Don't globally set float precision to mediump, only fragment shaders need that and defining it for vertex shaders causes tilemap cracks. Also manually define low precision for variables that hold color / alpha values.
39 lines
797 B
GLSL
39 lines
797 B
GLSL
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uniform sampler2D texture;
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uniform lowp vec4 tone;
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uniform lowp float opacity;
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uniform lowp vec4 color;
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uniform float bushDepth;
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uniform lowp float bushOpacity;
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varying vec2 v_texCoord;
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const vec3 lumaF = vec3(.299, .587, .114);
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void main()
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{
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/* Sample source color */
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vec4 frag = texture2D(texture, v_texCoord);
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/* Apply gray */
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float luma = dot(frag.rgb, lumaF);
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frag.rgb = mix(frag.rgb, vec3(luma), tone.w);
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/* Apply tone */
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frag.rgb += tone.rgb;
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/* Apply opacity */
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frag.a *= opacity;
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/* Apply color */
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frag.rgb = mix(frag.rgb, color.rgb, color.a);
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/* Apply bush alpha by mathematical if */
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lowp float underBush = float(v_texCoord.y < bushDepth);
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frag.a *= clamp(bushOpacity + underBush, 0.0, 1.0);
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gl_FragColor = frag;
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}
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